Replacement 3-Pack iRobot Roomba 545 Pet Series 6-Arm Side Brush - For iRobot Roomba Robotic Vacuum Parts Replacement iRobot Roomba 545 Pet Series 6-Arm Side Brush The Brush allows your Roomba to reach deeper into the carpet for a more thorough cleaning Replace side brush every 2 to 3 months for best performance Please check your Roomba to make sure you are purchasing the correct parts On Sale for a Limited Time!